T TT (T) Tt (T)
T Tt (T) tt (R)
B. All possible genotypes and phenotypes:
Genotypes: TT, Tt, tt
Phenotypes: Pointed tail (T), Rounded tail (R)
D. Chances of an offspring with a pointed tail: 75%
E. Chances of an offspring with a rounded tail: 25% T T
How can you find all possible genotypes and phenotypes?
T TT (T) Tt (T)
T Tt (T) tt (R)
The parent genotypes are both homozygous dominant (TT), meaning they each have two copies of the dominant allele for the pointed tail trait (T).
The possible gametes produced by each parent are both T (carrying the dominant allele).
When combining the gametes, we get four possible offspring genotypes:
TT: homozygous dominant for the pointed tail trait.
Tt: heterozygous for the pointed tail trait (one T and one t allele).
tt: homozygous recessive for the rounded tail trait (two t alleles).
Phenotypes:
The dominant allele (T) masks the recessive allele (t). Therefore, both TT and Tt genotypes will have pointed tails (T phenotype).
Only the tt genotype will have a rounded tail (R phenotype).
Chances of Offspring with Different Tail Shapes:
Pointed Tail:
TT: 1/4 (since there's one possibility for TT in the Punnett square)
Tt: 1/2 (since there are two possibilities for Tt in the Punnett square)
Total: 3/4 (1/4 + 1/2)
Percentage: 75% (3/4 * 100%)
Rounded Tail:
tt: 1/4 (since there's one possibility for tt in the Punnett square)
Percentage: 25% (1/4 * 100%)
Therefore:
B. List of all possible genotypes and phenotypes:
Genotypes: TT, Tt, tt
Phenotypes: Pointed tail (T), Rounded tail (R)
D. Chances of an offspring with a pointed tail: 75%
E. Chances of an offspring with a rounded tail: 25%